﻿/*
 * SonarAnalyzer for .NET
 * Copyright (C) 2014-2025 SonarSource Sàrl
 * mailto:info AT sonarsource DOT com
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the Sonar Source-Available License Version 1, as published by SonarSource SA.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the Sonar Source-Available License for more details.
 *
 * You should have received a copy of the Sonar Source-Available License
 * along with this program; if not, see https://sonarsource.com/license/ssal/
 */

namespace SonarAnalyzer.VisualBasic.Rules;

[DiagnosticAnalyzer(LanguageNames.VisualBasic)]
public sealed class IfCollapsible : IfCollapsibleBase
{
    private static readonly DiagnosticDescriptor rule = DescriptorFactory.Create(DiagnosticId, MessageFormat);

    public override ImmutableArray<DiagnosticDescriptor> SupportedDiagnostics { get; } = ImmutableArray.Create(rule);

    protected override void Initialize(SonarAnalysisContext context) =>
        context.RegisterNodeAction(
            c =>
            {
                var multilineIfBlock = (MultiLineIfBlockSyntax)c.Node;

                if (multilineIfBlock.ElseIfBlocks.Count > 0 ||
                    multilineIfBlock.ElseBlock is not null)
                {
                    return;
                }

                var parentMultilineIfBlock = multilineIfBlock.Parent as MultiLineIfBlockSyntax;

                if (parentMultilineIfBlock is null ||
                    parentMultilineIfBlock.ElseIfBlocks.Count != 0 ||
                    parentMultilineIfBlock.ElseBlock is not null ||
                    parentMultilineIfBlock.Statements.Count != 1)
                {
                    return;
                }

                c.ReportIssue(rule, multilineIfBlock.IfStatement.IfKeyword, [parentMultilineIfBlock.IfStatement.IfKeyword.ToSecondaryLocation(SecondaryMessage)]);
            },
            SyntaxKind.MultiLineIfBlock);
}
